AOL spent over $300 million in the 1990s to saturate the market with free trial CDs, leading to a significant increase in subscribers. The CDs were given away in various locations and are now collectibles with a market on eBay. If you received snail mail in the 1990s, no doubt you found some free American […]
Cadmium sulfide is a semiconductor mineral used as a yellow pigment and in some solar cells. It can be toxic and flammable when exposed to acid. Cadmium-based solar cells are controversial due to potential toxic exposure. Cadmium yellow is a popular pigment with complementary colors ranging from blue to aquamarine and adjacent colors from orange […]
